(Finalist for the 2012 Locus Award for Best Young Adult Book) Alek and Deryn are nearing the end of their round-the-world quest to end World War I and reclaim Alek's Austrian throne, in this third installment of Scott Westerfeld's superbly inventive and action-packed alternative history series. Then Leviathan is ordered to pick up an unusual passenger—a brilliant, half-mad inventor whose electrical generator Goliath may become a weapon terrible enough to end the war. But where do Nikola Tesla's loyalties truly lie? And how will the prince react when he learns that Mr. Daryl Sharp, his best friend on the voyage, is actually a girl named Deryn? Set in the time of World War I, in a world where Charles Darwin also discovered DNA and how to manipulate it, the Leviathan trilogy for readers 12 and up won the 2010 Locus Award for Best Young Adult Book for Leviathan, and earned finalist honors for both subsequent volumes. The Clankers—Germany, Austria-Hungary, and the Ottoman Empire—put their military faith in armored walkers and other machines, while the Darwinists—Britain, France, and Russia—fight with bizarre genetically engineered creatures, including the whale-like airship Leviathan. The adventures of Aleksandar Ferdinand, son of the assassinated Austrian archduke, began when he was taken aboard Leviathan and befriended Deryn Sharp, an airman who is not at all what he appears.